Turbine-stator blading.



A. JUDB.

TURBINE STATOR BLADING. APPLICATION FILED AUG. 6, 1914,

1 9 1 249029, Patented Jan. 5, 1915.

UNITED s'ra S PATENT OFFICE,

ALEXANDER JUDE, 0F BIRMINGHAM, ENGLAND, ASSIGNOR TO IBELLISS & MORCOM LIMITED, OF BIRMINGHAM, ENGLAND.

TURBINE-STATUE BLADING.

Application filed August 6, 1914.

To all whom it may concern:

Be it known that I, ALEXANDER J UDE, subject of the King of Great Britain, residing at Ledsam Street l/Vorks, Birmingham, in the county of Warwick, England, have invented certain new and useful Improvements in Turbine-Stator Blading, of which the following is a specification.

This invention relates to improvements in turbine stator blading and its object is to provide improved means for securing the stator guide blades of turbines to the diaphragm plates thereof, in a manner which avoids the use of rivets, screws or other individually manipulated fastenings for effecting the attachment of the blades to the diaphragm plates at the more or less inaccessible regions adjacent to the stator casing.

In the specification of British Patent No. 24:65? of 1912, I describe how the guide blades of turbines can be secured to strips of channel section the sides of which embrace the outer borders of the apertures in the diaphragm plates, the inner ends of the blades being secured to angle strips which by screws are secured to the diaphragm plates at the inner borders of the apertures thereof.

Now according to the present invention,

for the purposes of accurate manufacture and fitting, and ready accessibility, the channel strips at the outer ends of the blades, instead of embracing the outer border of the apertures of the diaphragm plates, are arranged to embrace the border of a ring of segments provided on or secured to each diaphragm plate. This arrangement enables the guide blading to be provided continuously around the turbine, owing to the border of the annular strip being uninterrupted, this being otherwise with the outer borders of the apertures of the diaphragm plates which are interrupted by the spokes which connect the outer and inner portions of the diaphragm plates.

Moreover, by means of the improved ar-- rangement, the inner ends of the guide blades can also be secured to strips of channel section, the sole attachment of which to an inner ring or segments, complementary to the above mentioned outer ring or segments, is effected by embracing the border thereof.

A further feature of the invention consists in interconnecting the outer and inner Specification of Letters Patent.

Patented Jan. 5, 1915.

Serial No. 855,403.

portions of the diaphragm plates of drum built turbines by tubes or rods.

Several examples of turbine stator blading and diaphragm plates embodying the present invention are illustrated on the accompanying drawings, in which Figure l is a transverse section through a portion of a turbine. Fig. 2 is a developed section, taken along the line 22 of Fig. 1. Figs. 3 and 4 are longitudinal sections through a portion of a turbine, taken along the lines 33 and H of Fig. 1, respectively. Figs. 5, 6 and 7 are similar longitudinal sections showing modifications.

In these figures, a is a diaphragm plate of a turbine. This plate a is secured to the stator casing b by being calked in an annular groove therein, or by means of bolts 0, or as shown in Figs. 1 and 3, by a combination of these two means.

The inner portion a of the diaphragm plate a is connected to and separated from the outer portion by means of spokes, the intervals between which constitute the apertures. The spokes are either integral with the inner and outer portions (1, and a of the diaphragm plate, as indicated by (Z, or are secured to both, as indicated by c.

Secured to the outer portion a of the diaphragm plate or formed integrally therewith, is a ring The inner border of this ring f is embraced by a channel strip 9 to which the outer ends of the guide blades h are riveted and soldered. At their inner ends the guide blades h are riveted and soldered to a channel strip '5, which embraces the outer border of an inner ring y'. This inner ring j is secured to the inner portion a of the diaphragm plate by screws 70. On withdrawal of the screws k, the inner ring j and the guide blades 71,, with their attached strips g and 2', can be detached from the diaphragm plate, by displacing the channel strip 9 from engagement around the border of the outer ring The annularly extending strips 9 and i are provided in a suitable number of butting segments, as are the rings f and j, the latter for instance being both in two segments butting at the usual horizontal joint of the turbine casing.

The spokes d and c are beveled to permit the steam to flow to the passages between adjacent guide blades, more or less covered by the spokes, as shown in Fig. 2.

As mentioned above, the outer and inner portions (4, a of the diaphragm plate can be interconnected by non-integral spokes.

In Figs. 14 the non-integral spokes 6 consist of tubes, the middle portions of Which are flattened and arranged approximately parallel With the flow of steam, and the ends of which are expanded in radial holes in the outer and inner portions a, a of the diaphragm plate. The spokes 6 instead of being tubes may be solid rods, the ends of which are bored out and expanded as shown in Fig. 6.

In the alternative construction shown in Fig. 5, the spokes e consist of round rods with their ends roughened, around which the outer and inner portions a, a of the diaphragm plate are cast. p

In a further alternative shown in Fig. 7 the spokes e' are solid rods secured in radial holes in the outer and inner portions a, a of the diaphragm plate, by transverse pins Z. These pins Z are also shown in Fig. 4 used in conjunction With the expanded ended tubular spokes,

' I claim:

1. In a turbine stator, a diaphragm plate having apertures, a ring at the outer borders of said apertures, a channel strip embracing the inner border of said ring, blades secured at their outer ends to said channel strip, a

strip secured to the inner ends of said blade and a ring engaged by said second strip and secured to said diaphragm plate at the inner borders of said apertures.

2. In a turbine stator, a diaphragm plate having apertures, a ring at the outer borders of said apertures, a channel strip embracing the inner borderof said ring, blades secured Copies of this patent may be obtained for at their outer ends to said channel strip, a channel strip secured to the inner ends of said blades and aring, the outer border of Which is embraced by said inner channel strip, secured to said diaphragm plate at the inner borders of said apertures.

3. In a turbine stator, a diaphragm plate consisting of an outer and an inner portion, non-integral spokes secured at their ends to and separating said outer and inner portions of said diaphragm plate.

4:. In a turbine stator, a diaphragm plate consisting of an, outer and an inner portion, and non-integral spokes secured at their ends in radial holes in. and separating said outer and inner portions of said diaphragm plate.

In a turbine stator, a diaphragm plate consisting of an outer and an inner portion, and spokes expanded at their ends in radial holes in said outer and inner portions of said diaphragm plate.

6. In a turbine stator, a diaphragm plate consisting of an outer and an inner portion, and tubular spokes expanded at their ends in radial holes in saidouter and inner portions of said diaphragm plate.

7. In a turbine stator, a diaphragm plate consisting of an outer and an inner portion, and flattened tubular spokes expanded at their ends in radial holes in said outer and inner portions of saiddiaphragm plate.

In testimony whereof I affix my signature in presence of two Witnesses.

ALEXANDER JUDE.

Witnesses: 1 I

EDWARD Laws, REGINALD A. VARDnh.

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

